75778021633 has 2 divisors, whose sum is σ = 75778021634. Its totient is φ = 75778021632.

The previous prime is 75778021621. The next prime is 75778021733. The reversal of 75778021633 is 33612087757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72026214129 + 3751807504 = 268377^2 + 61252^2 .

It is a cyclic number.

It is not a de Polignac number, because 75778021633 - 2⁵ = 75778021601 is a prime.

It is a super-2 number, since 2×75778021633² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75778021603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37889010816 + 37889010817.

It is an arithmetic number, because the mean of its divisors is an integer number (37889010817).

Almost surely, 2^75778021633 is an apocalyptic number.

It is an amenable number.

75778021633 is a deficient number, since it is larger than the sum of its proper divisors (1).

75778021633 is an equidigital number, since it uses as much as digits as its factorization.

75778021633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 49.

The spelling of 75778021633 in words is "seventy-five billion, seven hundred seventy-eight million, twenty-one thousand, six hundred thirty-three".